2.0 SHEAR
2.3 Steel Failure Mode
Variables k cp
Variables ACI 318-19 Chapter 17 Provision Comments for PROFIS Engineering
k cp
17.7.3.1 Nominal pryout strength , V cp for a single anchor or V cpg of an anchor group satisfying
17.5.1.3.1 , shall not exceed ( a ) or ( b ), respectively . ( a ) For a single anchor
( b ) For an anchor group
k cp
= 1.0 for h ef < 2.5 in . k cp
= 2.0 for h ef ≥ 2.5 in .
V cp
= k cp
N cp
( 17.7.3.1a )
V cpg
= k cp
N cpg
( 17.7.3.1b )
The parameter “ k cp
” is defined in ACI 318-19 as the “ coefficient for pryout strength ”. The commentary R17.7.3.1 states : “……………………… the pryout shear resistance can be approximated as one to two times the anchor tensile resistance with the lower value appropriate for h ef less than 2.5 in .”
PROFIS Engineering applies k cp per Section 17.7.3.1 for the cast-in anchors and post-installed anchors in its portfolio .
17.7.3.1.1 For cast-in anchors and post-installed expansion , screw , and undercut anchors , N cp shall be taken as N cb calculated by Eq . ( 17.6.2.1a ), and for adhesive anchors , N cp shall be the lesser of N a calculated by Eq . ( 17.6.5.1a ) and N cb calculated by Eq . ( 17.6.2.1a ).
17.7.3.1.2 For cast-in anchors and post-installed expansion , screw , and undercut anchors , N cpg shall be taken as N cbg calculated by Eq . ( 17.6.2.1b ), and for adhesive anchors , N cpg shall be the lesser of N ag calculated by Eq . ( 17.6.5.1b ) and N cbg calculated by Eq . ( 17.6.2.1b ).
254 NORTH AMERICAN PROFIS ENGINEERING ANCHORING TO CONCRETE DESIGN GUIDE — ACI 318-19 Provisions